Some other cannon salute info...
In the last video, the delay between shots is very pronounced - longer than the regulated 5 seconds. This may be explained by wanting to time the shots to end when the dignitary arrives.
“...For a visit from a dignitary such as President Lasso (President of Ecuador), a communications representative in the lead vehicle radios Capt. Nathan Lundquist, the battery officer in charge, as the vehicle passes by McClellan Gate. That starts the firing sequence. “We found through trial and error,” explained Lundquist, “that nine seconds is the interval spacing that gets the last round fired as they get to the Tomb.”...”
https://www.arlingtoncemetery.mil/Blog/Post/12870/Presidential-Salute-Battery-Honors-Dignitaries-and-Events
(this also explains why there is always an extra cannon - as a backup in case of a malfunction).
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thanks for that. That was way informative. That was my MOS ...105mm howitzers. Then I get sent over as a grunt...go figure.